Question

5x elevado 2 - 20x = 0

Answer 1

X(5x-20)=0
x=0 v 5x-20=0
x=0 v 5x=20
x=0 v x=20:5
x=0 v x=4

Answer 2

5x²-20x=0

x(5x-20)=0

x=0
5x-20=0

x=0
x= -20/-5

x=0
x= 4

Soluções finais:

x=0
x=4

Espero ter ajudado